Heating-furnace.



' c. N. BRETT.

HEATING'FURNAGB. y

APPLIAjTIoNILBp mi 2o. 1905,-

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, Immun f,

' No. 815,140. Speci'cation of Letters Patent.

' T0 (1f/ZZ whom, ii may concern: t

` CHARLES N. BRETT, OF VASSAR, MICHIGAN HEIATING-FURNACE. i

Application lea'May 20,190@ serial No; 261,402.

Beit known that I, CHARLES N. BRETT., a citizen of the United States of America, and a resident of Vassar,county of Tuscola, State of Michigan, have invented certain newfand luseful Improvements in Heating-Furnaces,

' of which thefollowingis afull and clear speciiication, reference being had to the accompanying drawings, in which-A v Figure l is a perspective view with the outer casing broken away to better show the flue arrangement. Fig. 2 is a vertical longitudinal section of the furnace.

' section on the line 3 3 of Fig. 2. Fig. 4 is a vertical section on the linee 4 vof Fig. k2. Fig. 5 is a vertical section on the line 5 5 of Fig. 2; and Fig. 6 is adetail perspective view of the vfront end of the fire-box, the front` wall of the casing being removed for purposes` of better illustration. Y

The object of this invention is to provide a' heating-furnace which shall be vsimply constructed and give the maximum ofY heating efficiency with a iven amount of fuel, as more fully hereina terset forth. Y Y, Y Y

To the` accomplishment of this object and such others as may hereinafter appear the invention consists of the parts and combina- Y to the exterior of the casing or the body B tion of parts hereinafter fully described, and particularly .pointedv out in the appended claims, reference being had to the accompanying drawings, forming a part of this specification, in which the same reference characters designate like parts throughout the several views. l, f

Referring to the drawings by letters, A designates the inc losing casing, to which hotair pipes (not shown) may be attached in the usual way and which is of the usual construction, except that its front wall is constructed of a series of plates riveted or bolted together, this sectional form of the front wall being desirable on account of convenience in manufacture, repair, and transportation.

The letter B designates the casing of the furnace proper, which is elliptical' in shape in cross-section and is constructed of sheet-steel bent into shape. The front and rear end walls C of the furnace each consists of a'castiron plate having a flange b2 cast on its inner face, which Jlits within the elliptical casing. Each end wall is also provided with lateral ears'c, throu h which the securin -bolts b pass, these bots being flattened and riveted Fig. 8 is a horizontal Patented March 13, 1906.

i and havingl their threaded endspassing through said ears and provided with nuts, whereby the end walls may befastened securely, but removably, to the body-shell.

T he smoke-flue J is connected to a flanged opening in the rear wall C, and a dam er j is mounted in this flue and is controllab e by a rod j', extending forward through the frontv wall of the casing.

Extending out'` laterally from each side'ofV .the combustion-chamber, at the rear end thereof, is a flue e, which is connected to the shell Aby a suitable flange riveted to the exte- .rior thereof. Each of these flues e extends 'forward to an opening inthe front wall of the casing, this opening being closed by a removable clean-out cap 7. Connected to each flue e near its forward end is a downward-extendlng f lue g, Vwhose lower end communicates e and likewise has its forward end accessible through an opening in the front lwall of the casing, ythis'opening also being closed by a removable cap if.

The flues h arev supported on lsuitable brackets fastened to the furnace-shelland extend around back of the same, where they are connected together and to an upri ht flue o, which is connected to the smokeue J at a point beyond the damper. Cast integral with the front wall C are two casings K and P, which are respectively provided at their forward ends with slotted lateral ears, (lettered, respectively, k and p,) by means of which ears andA suitable bolts these casings are rigidly, but removably, attached to the front wall of the casing.

with a flue h, which lies parallel with said flue The up er ycasing k is arch-shaped and is closed at its front end by a furnace-door K. The lower casing P is similar in shape and forms an extension of the ash-pit andis closed at its front end by the ash-pit door P.

The casing L is-bol-ted on the top wall of the ash-pit casing P and tapers inwardly and opens into the fire-box just 4above the grate.

The door L is mounted on the front wall ofy thek main casin in such position as to closethe forward `en of the casing L.

The bottom of the feed-casing K is provided with a graded opening n, and connecting this hole with a similarly-sized hole o in the top wall of the casing l is a vertical tube IOO m. lIn the top wall of the casing P,-which also forms the bottom wall of the casing L, is ,a hole o', which coincides with the hole o.

The casing L is secured, by means of suit- ITO able bolts and ears Z', to the top of casing P and the front side of the end wall @why means of slotted ears Z and suitable bolts to the front wall of the casing, as shown more particularly in Fig. 6.

.The grate-frame G is provided with lateral under lugs g, which work in opposite longitudinal grooves formed in cast bars G', riveted to the opposite inner walls of the elliptical shell. These grooves are continued at p in the ash-pit casing, whereby the entire grate-frame may be slid forward and out of the furnace through the ash-pit door P The rocking grate-bars g2 may be of any suitable construction and may be operated by depending bars g3, a connecting-rod g4, and a lever b', journaled on a pivot g5 in front of the casing.

lThe fire-pot consists of the four cast sections F, which are supported on the bars G', riveted to the interior of the shell. These sections are independently removable through the feed-door, and when in place they form a rectangular fireot. The faces of all the sections are vertica ly fluted or corrugated, and in addition the side sections and the front section have their top edges curved outward, so as to form air-spaces between these sections and the adjacent walls of the fire-box.

A series of holes f are formed in each of these sections to conduct the air out over the fire. Coincident with the inner end of the tubular casing L the front section F is provided with a hole f 2 to permit a clinker-bar to be passed into the fire-pot to break up and remove the clinkers.

To supply air to the air-space formed by the front sectionl and thence into the side airspaces, I provide two horizontal tubes o, which extend.from openings v in the front wall of the fire-box to coincident holes in the front plate of the main casing, these latter holes being covered by registers w.

It will be observed that in my invention I provide a'strong and durable furnace which is adaptedto burn hard or soft coal or wood and which shall be inexpensive to manufacture and easy of repair, as all the parts are accessible. It will be observed that I rovide fora long fire travel, and thereby obtain a maximum heat from 'a minimum of fuel, and in order that the draft shall be facilitated and the greatest amount of radiation obtained when the damper y' is closed I make the lower fire-flue 7L larger than the upper one.

A feature of importance lies in constructingV the body of the furnace proper of a steel shell and bolting thereto the flanged end walls, whereby a very strong and inexpensive construction is obtained. The steel strapbolts are important in that they permit expansion and contraction of the shell without loosening the parts, whereas should long bolts be employed to connect the two heads or end walls the bolts would expand and contract and loosen the oints between the end walls Yand the ends of the shell.

Another feature of importance lies in casting the feed-pouch and ash-pit extension upon the front cast wall of the furnace and in removably connecting it to the front wall of the main casing, whereby the parts are easily and quickly manufactured and assembled and are, furthermore, readily accessible for cleaning out and repairing. As will be observed, the holes o and o and tube m permit the dust from the ash-pit to be drawn up into the lire-box when the ash-door is opened, thereby preventing the dust escaping into the furnace-room. The manner of fastening and the location of the clinker-bar, tube, or pouch l is also advantageous on account of convenience of fastening it in place together with the dust-Hue m.

It will be observed, further, that by my construction I reduce the number of parts and joints to a minimum and also that I reduce the height of the furnace to a mimimum without reducing the radiating-surface, whereby my furnace is well adapted for use in low basements, as it permits ample elevation to be given to the hot-air pipes.

A further feature of importance lies in the provision of air-spaces behind the fire-pot linings, whereby an ample supply of heated air may be supplied to the combustion-chamber, which will be especially desirable when burning soft coal. These air-spaces also pre` vent the cast sections of the lire-pot from becoming overheated.

Other minor features of construction and advantage will be observed by those skilled in the art.

It will be apparent to those skilled in the art that various mechanical embodiments of the invention are possible, and I therefore do not wish to be limited to the exact arrangement and construction shown.

What I claim, and desire to secure by Letters Patent, is-

1. In a heating-furnace, the combination of a shell-likefire-box including an ash-pit having an end wall bolted over each end thereof, the front wall being provided with a feed casing or tube and an integral casing forming an extension of the ash-pit, this latter casing being provided with grooves p in its opposite sides, longitudinal supporting-strips G attached along the opposite sides of the firebox and provided with grooves registering with said grooves p in the ash-pit extension, a grate-carrying frame provided with oppositely-extending lugs slidable in said grooves, fire-pot sections within the ire-box, the side sections resting on said strips G and the front and back sections resting at their ends upon said strips and intermediate their ends upon the grate-frame, a casing inclosing the firebox and having its front wall bolted to the feed-chute and ash-pit extension.

IOO

of a shell-like lire-box, a removable end'wall bolted over each end thereof, the rear wall being provided with a smoke-outlet and the front Wall being provided with two air-inlets fv, an integral feed-chute K and an integral ash-pit extension P, the top of the ash-pit eX- tension and the bottom ofthe feed-chute being each provided with an opening, a casing L provided with a hole in its top bolted over the opening in the top of the ash-pit eXtension, avertical tube m connecting the hole in the top of the casing L to the hole in the bottom ofthe feed-chute, a sectional fire-pot supported within the re-box andhaving air-` chambers between its sections and the shelllike wall of the fire-box, these air-chambers being in communication with. the said inlets fo', a casing whose front wall is bolted to the i'ront ends of the casings K, L, and P and is provided with openings and doors opening into said casings, air-tubes connecting said inlets 'u' with the openings in the front wall of the furnace, which latter openings are controlled by registers, and a series of heatingues between the fire-box and the casing.

In testimony whereof I hereunto affix my signature, in the presence of two witnesses, this 11th day of April, 1905. 4

CHARLES N. BRETT,

` Witnesses:

` GEo. D. CLARKE,

RowE C. WIXsoN. 

